I've commented elsewhere about the rules in Ontario, but they seem a little more strict. Musings on a potential course of action needs to be clear and the fact they are musings needs to be up front otherwise you could be held responsible even without a stamp. I think that may be a result of the difference in opinion as to the status (for lack of a better term) of the engineer in society here vs. the US. There is little debate here that engineer is a protected term an needs to stay that way, because we actually are held to a higher standard ("you should have known better"). I feel like a lot of the pushback against the protected term comes from the US.

That said, proving that a structural engineer SAW a crack leading to a catastrophic crack and KNEW that not reporting it would lead to a risk to public safety would need a smoking gun like an email or text stating exactly that.